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x86/unwind: Fix oprofile module link error

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When compiling on x86 with CONFIG_OPROFILE=m and CONFIG_FRAME_POINTER=n,
the oprofile module fails to link:

  ERROR: ftrace_graph_ret_addr" [arch/x86/oprofile/oprofile.ko] undefined!

The problem was introduced when oprofile was converted to use the new
x86 unwinder.  When frame pointers are disabled, the "guess" unwinder's
unwind_get_return_address() is an inline function which calls
ftrace_graph_ret_addr(), which is not exported.

Fix it by converting the "guess" version of unwind_get_return_address()
to an exported out-of-line function, just like its frame pointer
counterpart.

Reported-by: Karl Beldan <karl.beldan@gmail.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: ec2ad9ccf1 ("oprofile/x86: Convert x86_backtrace() to use the new unwinder")
Link: http://lkml.kernel.org/r/be08d589f6474df78364e081c42777e382af9352.1475731632.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2016-10-06 00:28:40 -05:00 committed by Ingo Molnar
parent b91688f528
commit cfee9eddcd
2 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
arch/x86/include/asm/unwind.h
View File

@ -23,6 +23,8 @@ void __unwind_start(struct unwind_state *state, struct task_struct *task,
bool unwind_next_frame(struct unwind_state *state);
unsigned long unwind_get_return_address(struct unwind_state *state);
static inline bool unwind_done(struct unwind_state *state)
{
return state->stack_info.type == STACK_TYPE_UNKNOWN;
@ -48,8 +50,6 @@ unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
return state->bp + 1;
}
unsigned long unwind_get_return_address(struct unwind_state *state);
#else /* !CONFIG_FRAME_POINTER */
static inline
@ -58,16 +58,6 @@ unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
return NULL;
}
static inline
unsigned long unwind_get_return_address(struct unwind_state *state)
{
if (unwind_done(state))
return 0;
return ftrace_graph_ret_addr(state->task, &state->graph_idx,
*state->sp, state->sp);
}
#endif /* CONFIG_FRAME_POINTER */
#endif /* _ASM_X86_UNWIND_H */

10
arch/x86/kernel/unwind_guess.c
View File

@ -5,6 +5,16 @@
#include <asm/stacktrace.h>
#include <asm/unwind.h>
unsigned long unwind_get_return_address(struct unwind_state *state)
{
if (unwind_done(state))
return 0;
return ftrace_graph_ret_addr(state->task, &state->graph_idx,
*state->sp, state->sp);
}
EXPORT_SYMBOL_GPL(unwind_get_return_address);
bool unwind_next_frame(struct unwind_state *state)
{
struct stack_info *info = &state->stack_info;